Surface passivation for highly active, selective, stable, and scalable CO2 electroreduction

Jiexin Zhu, Jiantao Li, Ruihu Lu, Ruohan Yu, Shiyong Zhao, Chengbo Li, Lei Lv, Lixue Xia, Xingbao Chen, Wenwei Cai, Jiashen Meng, Wei Zhang, Xuelei Pan, Xufeng Hong, Yuhang Dai, Yu Mao, Jiong Li, Liang Zhou, Guanjie He, Quanquan Pang, Yan Zhao, Chuan Xia (), Ziyun Wang (), Liming Dai () and Liqiang Mai ()
Additional contact information
Jiexin Zhu: Wuhan University of Technology
Jiantao Li: Wuhan University of Technology
Ruihu Lu: The University of Auckland
Ruohan Yu: Wuhan University of Technology
Shiyong Zhao: University of New South Wales
Chengbo Li: University of Electronic Science and Technology of China
Lei Lv: Wuhan University of Technology
Lixue Xia: Wuhan University of Technology
Xingbao Chen: Wuhan University of Technology
Wenwei Cai: Wuhan University of Technology
Jiashen Meng: Wuhan University of Technology
Wei Zhang: Wuhan University of Technology
Xuelei Pan: Wuhan University of Technology
Xufeng Hong: School of Materials Science and Engineering, Peking University
Yuhang Dai: Wuhan University of Technology
Yu Mao: The University of Auckland
Jiong Li: Chinese Academy of Sciences
Liang Zhou: Wuhan University of Technology
Guanjie He: University College London
Quanquan Pang: School of Materials Science and Engineering, Peking University
Yan Zhao: Wuhan University of Technology
Chuan Xia: University of Electronic Science and Technology of China
Ziyun Wang: The University of Auckland
Liming Dai: University of New South Wales
Liqiang Mai: Wuhan University of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Electrochemical conversion of CO2 to formic acid using Bismuth catalysts is one the most promising pathways for industrialization. However, it is still difficult to achieve high formic acid production at wide voltage intervals and industrial current densities because the Bi catalysts are often poisoned by oxygenated species. Herein, we report a Bi3S2 nanowire-ascorbic acid hybrid catalyst that simultaneously improves formic acid selectivity, activity, and stability at high applied voltages. Specifically, a more than 95% faraday efficiency was achieved for the formate formation over a wide potential range above 1.0 V and at ampere-level current densities. The observed excellent catalytic performance was attributable to a unique reconstruction mechanism to form more defective sites while the ascorbic acid layer further stabilized the defective sites by trapping the poisoning hydroxyl groups. When used in an all-solid-state reactor system, the newly developed catalyst achieved efficient production of pure formic acid over 120 hours at 50 mA cm–2 (200 mA cell current).

Date: 2023
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DOI: 10.1038/s41467-023-40342-6

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